Mean (SD) domain responses for all patients at baseline and follow-up for COPD assessment test (CAT)
| Domain | Baseline (stage 1) | Follow-up (stage 2) | P value |
| Cough | 1.7 (1.2) | 1.2 (1.2) | <0.001 |
| Phlegm | 1.1 (1.4) | 1.0 (1.3) | 0.168 |
| Chest tightness | 2.1 (1.5) | 1.7 (1.3) | 0.002 |
| Breathlessness | 3.4 (1.2) | 2.4 (1.3) | <0.001 |
| Activity limitation | 3.1 (1.5) | 2.4 (1.3) | <0.001 |
| Confidence to leave home | 2.2 (1.6) | 1.8 (1.4) | 0.001 |
| Sleep | 2.7 (1.5) | 2.3 (1.5) | 0.006 |
| Energy | 3.5 (1.0) | 3.0 (1.1) | <0.001 |
COPD, chronic obstructive pulmonary disease.